Dust-collecting device for rock drills



April 3, 1928. 1,664,786

$.- MUMOVICH DUST COLLECTING DEVICE FOR ROCK DRILLS Filed July 26. 1926 INVENTOR SPlRO MuMowcH BY $10 M ATTOR N EYE of the workers therein,

UNITED STATES PATENT OFFICE.

SPIBO MUMOVICH, or AnYoX, BRITISH COLUMBIA, CANADA.

'DUS'I GOLLEGTING DEVICE FOR ROCK DRILLS.

Application filed July 26,

My invention relates to improvements in dust collecting devices for rock dr lls, which devices are adapted for use particularly in subterranean workings where artificial ventilation is resorted to and vaihng carries the suspension, seriously their respiratory organs the draught predust, from the drilling, in endangering the lives through its entering by inhalation. The

objects of the invention are to provide means whereby the cuttings and dust from the drilling are confined within the hole drilled and a small area therearound and are conducted from thence to a suitable rec eptacle,

from which it can be removed as and where desired, so that the air available for respiration in the workings is unimpaired.

The invention consists essentially o ible cup adapted to surround the drill rod on a drilling machine of rotary, reciprocating or any other type, and is held in lntimate contact with the surface surrounding the hole drilled and means for dust or cuttings discharged into the cup, into a suitable recept will be more fully described in the to specification, in which conveying the from the hole acle, as llowing The drawing 15 a general view, part in section, of the device attached to a drilling machine.

rotary type The numeral 1 indicates generally a rock drilling machine of the rotary type having a cylinder body 2, a support head 3 fronthead l having the usual stuflin and a g box 5 through which a shaft 6 is rotatably movable.

The numeral 7 indicates an extension leg threaded at its upper end as at 8, the

threaded portion being fitted into a correspondingly threaded aperture 9 in the support so that by rotating from the head 3 the drilling machine drill is advanced up to its work. Co

head 3,

the leg 7 to unscrew it and its nnected to the shaft 6 is a drill rod 10 having a cutting bit 11 at its upper extremity by which the drilling is efiected. The numeral 12 indicates the surface of the working, shown in section in the drawing, in which a is being drilled.

hole 13 Mounted upon the drill rod cated by the numeral 17 is preferably her or other flexible material and is p with a flared lip 18 which is adapte of rubrovided d to lie 1926. Serial No. 125,090.

in intimate contact with the surface of the working 12. Extending from the cup 14c adjacent its base is a rigid tube 19 which extends downwards past the cylinder 2 in parallel relation thereto and is slidably supported therefrom by a pair of straps 20. Mounted upon the tube 19 and in bearing contact with one of the straps 20 is a coil spring 21, the upper end of which is adjustably engaged by a collar 22, which collar is adapted to be secured to the tube by a wing bolt 23 so that sr. icient compression may be provided n the spring to raise the tube 19 and hold he cup la: into such firm engagement with he surface of the working that no dust talling't'rom the hole 18 may escape around the iiared lip 18 ot' the rubber portion 17 of the cup. An alternate means of supporting the cup in contact with the working would be to provide the tube with a substantially tight fitting collar of rubber or other suitable material which would bear against one of the straps 20.

The numeral 24; indicates a container or other suitable receptacle having a nozzle 25 between which and the tube 19 a hose 26 is connected for the purpose of conveying the dust from the cup into the container. When it is desired to use the device on a reciprocatory and rotatory drilling machine having a blower tube extending axially through the piston and fitted with axially bored drill rods and bit, air would be caused to flow through the machine and its drill bit, so as to provide force to eject the dust. In such an installation a bag of closely woven textile fabric would be used to receive the dust and to permit the escape of the air therefrom through the weave of the material.

Having thus described the several parts of my invention I will use.

The drill equipped with the dust collecting device adapted for gravity discharge may be effectively used in any position from a slight upward incline from the horizontal to a vertical position, and if equipped for blower discharge it may be effectively used when drilling on a downward incline. The wing bolt 23 is slackened oil to free the collar 22 from the tube 19, which tube is lowered to fully expose the bit 11, the drilling machine is placed in position with the bit against the surface 12 of the working and the leg 7 is unscrewed to engage upon a suitable bearing now briefly explain its work. The tube 19 is then raised until the cup 14 is in firm engagement with the surface of the working, when the spring 21 is compressed and so held by the tightening of the collar 22 to the tube. 7 above referred to may be such as to hold the springcompressed only, but 'to allow the tube to slide therethrough when sufficient force is applied. As the hole is extended by the: cutting; action of the bit 11 the leg 7 is unscrewed to iulvance the drill to its work, which action also serves to maintain a proper contact between the lip of the cup, 14. and .the surface of the working. 7

it will thus be seen that I have invented a device by which cuttings and dust may be confined and collected in such a manner that the ventilation in the workings is unimpaired and that healthier working conditions. would prevail therein than is possible without its use.

What I claim as my invention is:

1. The combination with a rock drilling machine including a cylinder and a drill rod of bearingmembers carried by and projecting laterally from said cylinder, a rigid dust conveying tube slidably mounted in said The ti htenin bearing members, an abutment carried by said tube, aspring confined between said abutment and one of the bearing, members and tending to move the tube in the direction of the work;and adustcollecting cup carried by said tube and receiving the drill rod therethrough the interior of said cup being in communication with the interiorof said tube. I

2. The combination with a rock drilling machine including a cylinder and a drill rod of bearings carried by and projecting laterallyfrom the cylinder, arigid dust eon veying tube slidably mounted in said bear ings, and formed at one end with an integral laterally ofiset cup having a central opening receiving the drill rod therethrough; a flexible lip carried by said/cup, and a spring encircling said tube and confined in com pression between an abutmenton the tube and one of said bearings so as to normally tend to slide the tube in the direction-of the work to maintain contact betweenthe Work and the flexible lip of the cup.

Dated at Anyox, B. C., Canada, this 10th of July, A. D1926. v v

SPIRO MU-MOVICH. 

